CN218431605U - Electric power-assisted bicycle middle-arranged motor with torque coupling device - Google Patents

Abstract

The utility model discloses an put motor in electric power-assisted bicycle with moment coupling device. The technical scheme of the utility model is that: the bicycle comprises a shell structure, wherein a driving motor, a speed reducer, a torque coupling device, a center shaft, a torque sensor, a rotating speed sensor and a motor controller are arranged in the shell structure, and the shell structure is arranged in a five-way hole of the center shaft of a common bicycle through a sleeve or is arranged on bicycle frames of different structures through a hanging piece. The driving power of the driving motor is transmitted to a large gear of the torque coupling device through a reducer gear, and a middle ring of the torque coupling device is driven through an outer ring one-way clutch of the coupling device; the manpower riding torque is transmitted to the inner ring of the torque coupling device through the crank and the middle shaft, and is also transmitted to the middle ring through an inner ring one-way clutch in the coupling device. The driving torque and the manual riding torque coupled on the middle ring output driving power through a chain wheel connected with a middle ring screw, and the rear wheel is driven through a chain to realize running.

Description

Electric power-assisted bicycle middle-arranged motor with torque coupling device

Technical Field

The utility model relates to the technical field of electric machines, in particular to put motor field in electric power bicycle.

Background

In recent years, electric power-assisted bicycles are widely popular in the market and increasingly sold in the world due to the characteristics of combination of environmental protection and sports health. Electric bicycle receives more and more attention in the bicycle field with its laborsaving, energy-conserving characteristics, especially puts the moped of motor helping hand mode in, and the motor helping hand control system who combines to form with torque sensor has characteristics such as the response is fast, the helping hand is reasonable controllable, motorcycle type adaptability is wide, ride and experience well, more and more becomes the leading direction of moped motor technical development.

The electric power-assisted bicycle has a plurality of patents in the aspect of a middle motor, and the main purpose is to integrate a power-assisted motor, a speed reducer, a sensor and a controller into a whole, and simultaneously achieve small volume and light weight as far as possible. In fact, some of the granted patent technologies are not fully functional, for example, patent CN2561697Y in zhang xianzhong of taiwan introduces a middle-mounted motor that combines a motor, a speed reducer and a manual pedaling riding, and can be conveniently mounted on various existing bicycles to realize power-assisted riding. Some patents have more function integration, for example, patent CN103496427B and CN105667697B that the japanese bring out a good job in the profession have similar structures, trample the ride with motor, reduction gear, sensor, controller and manpower and combine together, realize the helping hand and ride, but the sensor structure of this scheme is too complicated, leads to the system reliability low, and manpower and electronic coupling mode lead to the system to seal the degree of difficulty and improve simultaneously, and is waterproof not good, this practical value that all significantly reduces. The applicant also provides a targeted solution in earlier stage, for example, patent CN201910348561.3 provides a mid-motor integration scheme, which solves the problems of a motor, a speed reducing mechanism, a sensor, a transmission coupling scheme and the like, and is installed near a five-way position of a frame through a complete shell and a suspension member structure, so that a riding assistance mode of driving a rear wheel by combining manpower riding and electric assistance is realized, and a good assistance effect and riding experience are obtained. Another patent CN201520247924.1 in the present applicant provides a technical solution for a built-in torque sensor system of a mid-motor, which can realize structural integration with a motor system, and provide a torque signal and a pedal frequency signal, thereby improving the accuracy of electric power assistance control and the power assistance effect of riding. These systems functionally achieve the desired goal, but their structures are still complex, have many parts, and have life and reliability problems that need to be further improved.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model mainly aims to provide a motor capable of improving the integration level of a mid-set motor and reducing the number of parts; improve spare part atress, improve waterproof performance, improve system's life-span, reduce system's noise simultaneously, put motor in the electric power bicycle that has moment coupling device that improves the comfort of riding and the ride comfort of helping hand.

In order to achieve the above purpose, the utility model provides a following technical scheme: an electric power-assisted bicycle middle motor with a torque coupling device comprises a shell structure, wherein a driving motor, a speed reducer, a torque coupling device, a center shaft, a torque sensor, a rotating speed sensor and a motor controller are arranged in the shell structure, the shell structure is arranged in a five-way hole of a center shaft of a common bicycle or is arranged on bicycle frames of different structures through a hanger, the center shaft is connected with the torque coupling device, two ends of the center shaft are provided with conical surfaces capable of being provided with a crank and a bicycle pedal, the torque coupling device comprises an outer ring, an outer ring one-way clutch, a middle ring, an inner ring one-way clutch and an inner ring, a flange plate of the inner ring is connected with an outer ring hole of the torque sensor, the outer ring one-way clutch is arranged between the outer ring and the middle ring, the inner ring one-way clutch is arranged between the inner ring and the middle ring, the chain wheel is fixedly connected with a threaded hole at the end part of the middle ring through a screw, the inner ring one-way clutch and the outer ring one-way clutch are used for releasing in one-way rotation, locking in the reverse direction and transmitting torque, the torque sensor and the rotating speed sensor are arranged between the middle shaft and the inner ring of the torque coupling device, the driving power of the driving motor is transmitted to the outer ring of the torque coupling device through a speed reducer gear, the driving power is coupled with the power of the inner ring of the torque coupling device driven by manpower riding on the middle ring, the middle ring of the torque coupling device and the chain wheel connected with the middle ring through the screw output driving power and drive the rear wheel through a chain, a controller cover is arranged outside the motor controller, the motor controller and the speed reducer cover are packaged with the shell, and then a plastic shell is mounted to form a full packaging structure of the whole motor.

Preferably, the outer ring of the torque coupling device can be combined with the large gear into a whole, or the torque coupling device can be disassembled into a split outer ring and a split large gear, and the split outer ring and the split large gear are connected through a flat key.

Preferably, the end face of the middle ring of the torque coupling device is provided with five threaded holes, the five threaded holes are connected with the five-jaw disc through screws, and a plastic shell sealing ring is arranged on the outer cylindrical matching surface of the plastic shell and the middle ring.

Preferably, both ends of the middle shaft are provided with sealing rings, the left sealing ring is arranged at the position of the shell sleeve part and the left side near end part of the middle shaft, and the right sealing ring is arranged at the position of the five-claw disc matched with the middle shaft.

Preferably, the inner ring of the moment coupling device is in clearance fit with the middle shaft.

The utility model has the following advantage for prior art, the in put motor that has moment coupling device is integrated driving motor, reduction gear, moment coupling device, axis, sensor and machine controller in a casing, the mountable in ordinary bicycle axis five-way hole, perhaps installs on the bicycle frame of isostructure through the pendant, have characteristics such as small, light in weight, power height, influence lessly to the bicycle appearance, be applicable to different motorcycle types.

The moment coupling device integrates the gear structure and the double-clutch structure, further simplifies the whole structure, is reasonable in assembly process, has higher integration level, high reliability, long service life, small occupied space, is waterproof and simple, has strong bearing capacity, and is more suitable for functional requirements of high integration level, high-power output, good riding experience and the like of a middle motor of a power-assisted bicycle. The clutch structure that adopts makes transmission noise littleer, and the travelling comfort improves. This put in motor whole encapsulation better, expose that the position all adopts seal structure, and it is less to the negative effect of riding experience, have better wholeness and leakproofness.

The installation of this in put motor is simple, only need to put the sleeve of motor in and pass five through-holes of bicycle standard, then install the back in proper order with fixed bolster, nut catch and the outer gadget of nut catch, can be with on the fixed bicycle of in put motor, then installation sprocket and chain can ride, have the benefit of installation, use and maintenance convenience etc..

Drawings

Fig. 1 is a structural schematic diagram of the shape of the mid-motor of the present invention;

fig. 2 is a schematic cross-sectional view of the mid-motor of the present invention;

fig. 3 is a cross-sectional view of a torque coupling device in accordance with an embodiment of the present invention;

fig. 4 is a first schematic structural diagram of a torque coupling device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a torque coupling device according to an embodiment of the present invention;

FIG. 6 is a sectional view of the mid-motor of the present invention mounted on a frame with a suspension member;

FIG. 7 is an installation outline drawing of the mid-motor of the present invention on a frame with a pendant;

fig. 8 is a sectional view of the mid-motor of the present invention mounted on a common frame;

fig. 9 is an installation outline view of the mid-set motor of the utility model on a common frame;

fig. 10 is a schematic structural diagram of a second embodiment of the torque coupling device according to the present invention.

In the figure: 1. a middle shaft; 2. a left clamp spring; 3. locking the nut; 4. a left side bearing; 5. a housing sleeve portion; 6. a right side bearing; 7. a slip ring auxiliary fixing piece; 8. a motor shell is arranged in the middle; 9. a pin; 10. a plastic shell; 10a, a plastic shell sealing ring; 11. a torque coupling device; 12. a screw; 13. a right clamp spring; 14. a moment deformation block; 15. a slip ring secondary rotor; 15a, magnetic steel; 16. an intermediate shaft; 17. an intermediate shaft pinion; 18. a bearing on the right side of the intermediate shaft; 19. a reducer cover; 20. a motor controller cover; 21. a motor controller; 22. a motor output gear shaft; 23. a first-stage reduction gear wheel; 24. a one-way bearing; 25. a clamp spring; 26. a left bearing of the intermediate shaft; 27. a drive motor; 28. a fixed fork; 29. an exterior trim; 30. a left side seal ring; 31. a speed module; 40. an inner ring pin hole; 41. an inner ring flange; 42. an inner ring; 43. A threaded hole; 44. a middle ring; 45. an oil sump; 46a, an inner ring one-way clutch; 46b, an inner ring bearing; 47a, outer ring one-way clutch; 47b, outer ring bearing; 48. an outer ring; 49. a bull gear; 50. a frame; 51a, an upper hanging piece; 51b, a lower hanging piece; 52. a middle motor assembly; 53a, left crank; 53b, right crank; 54a, left set screw; 54b, right set screw; 55. a sprocket; 56. a sprocket cover; 57. a five-claw disc; 58. a right side sealing ring; 59. a screw; 60. a common frame; 61. a five-way pipe; 70. a flat bond; 71. A split outer ring; 72. a split large gear.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in figures 1-9, when the middle motor works, the bicycle is pedaled by manpower, and the pedaled torque is directly applied on the middle shaft 1 through cranks 53a and 53b, 5 threaded holes are arranged on the flange 1a of the middle shaft and are connected with the inner ring hole of the torque deformation block 14 through 5 screws 12, the outer ring hole of the torque deformation block 14 is connected with the inner ring pin hole 40 of the torque coupling device 11 through a pin 9, thus the pedaled torque on the middle shaft 1 is transferred to the inner ring 42 of the torque coupling device 11, and the torque deformation block 14 is also deformed under the action of the pedaled torque, and the sensing device arranged on the torque deformation block can sense the tiny deformation to output a voltage signal, namely the pedaled torque signal for riding. In order to transmit the voltage signal from the sensor device mounted in the moment deformation block 14, the moment deformation block 14 and the housing 8 are respectively provided with a rotor 15 and a stator 7 of a slip ring pair. The rotating part 15 is provided with a slideway, the fixing part 7 is provided with a contact, the two are coaxially and oppositely arranged, the contact is in contact with the corresponding slideway, and a voltage signal is transmitted out through the slideway and the contact and is connected into a motor controller 21 in the shell 8. The excircle position of rotating piece 15 installs round magnet steel 15a, installs speed module 31 in the relative position of casing 8, and when magnet steel 15a passed through speed module 31, speed module 31 can produce pulse signal, and the pulse number that whole circle magnet steel 15a produced through speed module 31 just can calculate the rotational speed of driving medium 15, and what also ride steps on frequently the signal, transmits controller 21 for the same time. Thus, the motor controller 21 can control the driving motor 27 to output the driving power according to the torque signal and the frequency signal.

The key part of the centrally-mounted motor is a torque coupling device 11, which efficiently integrates a torque sensor and a speed reducer together, greatly saving space and having a structure as shown in fig. 3-5. The middle motor is arranged on the frame in two modes, one mode is that the middle motor is arranged on the frame through a hanging piece, and the hanging piece is shown in figures 6-7; the other type is directly arranged in a five-way pipe of a common frame as shown in figures 8-9. The torque coupling device 11 of the centrally-mounted motor has higher integration level, but also brings processing difficulty, so that a second embodiment of the torque coupling device is provided, as shown in fig. 10, an outer ring large gear of the torque coupling device is divided into a split outer ring 71 and a split large gear 72, the two are in tight fit, and are connected by a flat key 70. The scheme greatly reduces the processing difficulty, the size of the structural space is unchanged, and only one flat key 70 is added.

The middle shaft 1 of the middle motor is rotatably supported in a sleeve part 5 of a shell 8 through two pairs of bearings 4 and 6 arranged on two sides, the sleeve 5 can be arranged on a frame 50 through hanging pieces 51a and 51b, or can be arranged on a common frame 60 through a five-way pipe 61, and a locking nut 3 and an outer decoration 29 are arranged on threads at the end part of the sleeve 5, so that the motor is firmly fixed on the hanging pieces 51a and 51b or the five-way pipe 61. The central motor housing 8 is provided with a circular interface which is directly connected with a driving motor 27, so that an output gear shaft 22 of the driving motor 27 is meshed with a first-stage reduction gear 23 arranged on a reducer intermediate shaft 16, and the first-stage reduction and torque increase of the power of the driving motor are realized. The intermediate shaft 16 is supported on the housing 8 and the speed reducer cover 19 through bearings 26 and 18, and the speed reducer cover 19 is fixedly connected with the housing 8 through a circular interface, so that the intermediate shaft 16 is reliably fixed. The one-way bearing 24 is fixed on the intermediate shaft 16 through the snap spring 25, so that the gear 23 transfers the motor torque to the intermediate shaft 16, the pinion 17 on the right side of the gear is meshed with the outer ring gearwheel 49 of the torque coupling device 11, the second-stage speed reduction and torque increase of the power of the driving motor are realized, and the torque of the driving motor 27 is increased and then transferred to the outer ring 48 of the torque coupling device 11. The moment coupling device 11 can couple the moments of the inner ring 42 and the outer ring 48 and output the moments to the middle ring 44, the middle ring is provided with 5 threaded holes, the five-claw disc 57 is connected with the middle ring 44 through 5 screws 59, the five-claw disc 57, the chain wheel 55 and the chain wheel cover 56 are connected into a whole through rivets, so that the man power riding moment and the driving motor moment of the middle-placed motor are coupled to the moment coupling device 11 and output to the chain wheel 55, and a driving chain drives a rear wheel to realize electric power-assisted riding movement.

The torque coupling device 11 of the middle motor is a key for improving the system integration level, and mainly comprises an inner ring 42 with a flange plate 41, an outer ring 48 with a large gear 49, an inner ring bearing 46b, an inner ring one-way clutch 46a, an outer ring bearing 47b, an outer ring one-way clutch 47a and a middle ring 44 with a threaded hole 43. The flange 41 is provided with a circle of pin holes 40, which are connected with the outer ring of the moment deformation block 14 through pins 12, and the treading moment acting on the middle shaft 1 is transmitted to the inner ring 42 of the moment coupling device 11 through the moment deformation block. The large gear 49 is a second stage transmission gear of the middle motor speed reducing system, is meshed with the small gear 17 on the intermediate shaft 16, converts the high rotating speed and the small torque of the driving motor 27 into the low rotating speed and the large torque of the gear, and transmits the low rotating speed and the large torque to the outer ring 48 of the torque coupling device 11. The structure of the inner ring one-way clutch 46a ensures that the torque from the inner ring 42 is transmitted to the middle ring 44 in one way and is transmitted to the five-claw disc 57 and the chain wheel 55 which are connected with the middle ring through 5 screws, and then the chain wheel 55 drives the chain connected with the chain wheel to drive the rear wheel to rotate, thereby realizing the manual riding movement. The structure of the outer ring one-way clutch 47a ensures that the electric power-assisted torque from the large gear 49 is transmitted to the middle ring 44 in one way, so that the coupling of the manpower riding torque and the electric power-assisted torque is realized. If the manual treading direction is clockwise during normal riding, the inner ring one-way clutch 46a is locked to ensure that the middle ring 44 rotates along with the clockwise direction; when the manual pedaling direction is counterclockwise, the inner ring one-way clutch 46a is disengaged, and the middle ring 44 does not rotate in the crank direction. The outer ring one-way clutch 47a has the same function, when the torque direction of the large gear 49 is clockwise, the outer ring one-way clutch 47a is locked, and the middle ring 44 and the large gear 49 rotate clockwise together; when there is no torque on the large gear 49, the outer ring one-way clutch 47a is disengaged and the middle race 44 remains rotated clockwise under the torque of the manual riding. The inner ring bearing 46b and the outer ring bearing 47b can ensure that the torque coupling device can bear certain axial force while bearing radial force, and are suitable for the stress characteristic of complex movement during manual riding and the axial force action caused by the helical gear adopted by the speed reducer. It can be seen that the basic structure of the torque coupling device 11 is a two-way clutch, which enables a one-way coupling of the torques of the outer ring 48 and the inner ring 42 on the middle ring 44.

In the patent, the inner ring 42 of the torque coupling device 11 of the motor is in clearance fit with the middle shaft 1, so that the inner ring 42 and the middle shaft 1 are allowed to rotate to a certain extent. When the moment deformation block 14 is deformed under the action of riding moment, the inner ring 42 and the middle shaft 1 slightly rotate. The inner ring 42 is provided with a plurality of tiny oil grooves 45, wherein the friction force of the clearance fit surface is negligibly small by coating grease, and meanwhile, the rusting is also prevented. The clamp spring 13 is installed on the middle shaft 1, so that the axial movement of the torque coupling device 11 on the middle shaft 1 is limited, and the torque coupling device 11 can only rotate on the middle shaft 1 of the middle motor. The flange plate 1a on the middle shaft 1 is connected with an inner ring threaded hole of the moment deformation block 14 through 5 screws, a pin 9 is inserted into an outer ring hole of the moment deformation block 14, the other end of the moment deformation block is inserted into a pin hole 40 on an inner ring flange 41 of the moment coupling device 11, the torque borne by the moment deformation block 14 is transmitted to the inner ring flange 41, and is transmitted to the middle ring 44 through an inner ring one-way clutch 46b, and the output of the torque of manpower riding is realized. The outer ring 48 and the large gear 49 of the moment coupling device are of an integral structure, and the torque of the large gear is directly transmitted to the middle ring through the outer ring one-way clutch 47b, so that the output of the electric power-assisted torque is realized.

This patent provides the second scheme of moment coupling device 11, and components of a whole that can function independently gear wheel 72 and components of a whole that can function independently outer lane 71 are the components of a whole that can function independently structure, and the tight fit through its face of cylinder is with the two pressure equipment together to connect through flat key 70, make the electric power-assisted moment of torsion on the components of a whole that can function independently gear wheel 72 reliably transmit for components of a whole that can function independently outer lane 71, then continue to transmit for centre circle 44 through outer loop one-way clutch 47a, realize moment coupling output. The split structure of the split large gear 72 and the split outer ring 71 reduces the processing and installation difficulty of the torque coupling device 11, but the structural space is not changed, which is beneficial to controlling the system cost. The moment coupling device enables electric power assistance and manpower to independently drive the chain wheel and can also be coupled with the driving chain wheel. Wherein, the feeling of riding by manpower is not different from that of a common bicycle, and pure electric drive can be realized. Due to the adoption of the structural principle of the one-way clutch, the transmission noise in driving is low, and the riding comfort is improved.

In order to ensure the integrity, the sealing waterproof and the dustproof capability of the middle motor, a controller cover 20 is arranged outside a motor controller 21, the motor controller 21 and a speed reducer cover 19 are packaged with a shell 8, and then a full packaging structure of the whole motor is formed by mounting a plastic shell 10, so that the integrity and the sealing property of the middle motor are improved. Besides a wire harness interface, the appearance of the middle motor assembly also comprises input ends on two sides of a middle shaft 1 and a middle ring output end face of a torque coupling device 11, and other positions are all of packaging structures, so that the middle motor assembly has better integrity and sealing performance. The sealing rings are arranged at two ends of the middle shaft 1, the left sealing ring 30 is arranged at the position of the shell sleeve part 5 and the left side near end part of the middle shaft 1, and the right sealing ring 58 is arranged at the position of the five-claw disc 57 matched with the middle shaft 1, so that water and dust can be prevented from entering the motor from two ends of the middle shaft 1. Although both the two sealing rings have certain friction torque, the diameter of the middle shaft is small, so that the friction torque is small, and the influence on riding feeling can be ignored. In addition, after the five-jaw disc 57 is mounted on the end face of the middle ring 44 of the torque coupling device 11, a plastic shell sealing ring 10a is mounted on the matching surface of the plastic shell 10 and the middle ring 44, and water and dust are prevented from entering the position. In fact, after the five-claw disc 57 is installed, the plastic shell 10 and the middle ring 44 are completely covered, so that a certain waterproof and dustproof effect is achieved, and after the plastic shell sealing ring 10a is installed, the good sealing performance and the good waterproof performance of the whole middle-placed motor are further guaranteed.

The mode of operation of putting the motor in this patent has three kinds, is manpower mode of riding, pure electric drive mode and electric power assisted mode of riding respectively. In the manual riding mode, the driving motor 27 does not work, the outer ring one-way clutch 47a of the torque coupling device 11 is disengaged, the inner ring one-way clutch 46a is locked, and the torque transmission path is as follows: the middle shaft 1, the moment deformation block 14, the inner ring 42, the inner ring one-way clutch 46a, the middle ring 44, the five-jaw disc 57 and the chain wheel 55 realize a traditional manpower riding mode.

In the pure electric driving mode, manpower is not needed to be stepped on, a rotating handle signal arranged on a handlebar is connected with the motor controller 21, the driving motor 27 is controlled to output power, and the power is decelerated and torque is increased through the speed reducer to form torque output on the large gear 49 (or the split large gear 72). At the same time, the inner ring one-way clutch 46a of the torque coupling device 11 is disengaged, the outer ring one-way clutch 47a is locked, and the torque transmission path is: the drive motor 27, the gear shaft 22, the primary reduction gear wheel 23, the one-way bearing 24, the intermediate shaft 16, the intermediate shaft gear 17a, the large gear 49 (or split large gear 72), the outer ring 48 (or split outer ring 71), the outer ring one-way clutch 47a, the middle ring 44, the five-jaw disc 57 and the chain wheel 55 realize a pure electric drive mode.

In the electric power-assisted riding mode, the rider rides manually, riding torque acts on the middle shaft 1, a sensing device arranged on the torque deformation block 14 generates a voltage signal and transmits the voltage signal to the motor controller 21, then the driving motor 27 is controlled to output a certain torque to act on the gear shaft 22, and the torque is output on the large gear 49 (or the split large gear 72) after the speed reduction and torque increase of the speed reducer. At this time, the inner ring one-way clutch 46a and the outer ring one-way clutch 47a of the torque coupling device 11 are both locked, and the torque transmission path is a two-in-one coupling process: namely, the riding torque of the manpower riding mode and the electric driving torque of the pure electric driving mode act on the middle ring 44- > five-jaw disc 57- > chain wheel 55, and the electric power-assisted riding mode is realized.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. The utility model provides a put motor in electric power assisted bicycle with moment coupling device which characterized in that: the torque coupling device comprises an outer ring, an outer ring one-way clutch, a middle ring, an inner ring one-way clutch and an inner ring, wherein a flange plate of the inner ring is connected with an outer ring hole of the torque sensor, the outer ring one-way clutch is arranged between the outer ring and the middle ring, the inner ring one-way clutch is arranged between the inner ring and the middle ring, a chain wheel is fixedly connected with a threaded hole at the end part of the middle ring through a screw, the inner ring one-way clutch and the outer ring one-way clutch are used for unidirectional rotation releasing and reverse locking and transmitting torque, the torque sensor and the rotation speed sensor are arranged between the middle ring and the inner ring of the torque coupling device, and the driving power of the driving motor is transmitted to the outer ring of the torque coupling device through a gear of the speed reducer and is transmitted to the middle ring through the outer ring one-way clutch; the torque of the manual riding driving center shaft is transmitted to the inner ring of the torque coupling device and transmitted to the middle ring through the inner ring one-way clutch, the power of the torque coupling device and the middle ring is coupled on the middle ring, the middle ring of the torque coupling device and a chain wheel connected with the middle ring through a screw are driven to output driving power, the rear wheel is driven through a chain to realize driving, a controller cover is arranged outside the motor controller, the motor controller and the speed reducer cover are packaged with the shell together, and then a plastic shell is mounted to form a full packaging structure of the whole motor.

2. The middle-mounted electric motor with force-torque coupling device for electric bicycle of claim 1, wherein: the large gear and the outer ring of the torque coupling device can be combined into a whole, or the torque coupling device can be disassembled into a split outer ring and a split large gear, and the split outer ring and the split large gear are connected through a flat key.

3. The middle-mounted electric motor with force-torque coupling device for electric bicycle of claim 1, wherein: the end face of the middle ring of the moment coupling device is provided with five threaded holes which are connected with the five-claw disc through screws, and a plastic shell sealing ring is arranged on the outer cylindrical matching surface of the plastic shell and the middle ring.

4. The middle-mounted electric motor with force-torque coupling device for electric bicycle of claim 1, wherein: sealing rings are arranged at two ends of the middle shaft, the left sealing ring is arranged at the position of a shell sleeve part and the left side near end part of the middle shaft, and the right sealing ring is arranged at the position of the five-claw disc matched with the middle shaft.

5. The mid-motor of an electric bicycle with a torque coupling device as claimed in claim 1, wherein: the inner ring of the moment coupling device is in clearance fit with the middle shaft.

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